Toilet stool



FIG. 1 is a front perspective view of a toilet stool, showing the new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a right side view thereof; and,

FIG. 9 is a rear view thereof.

The uniformly dashed lines shown in the drawings illustrate portions of the toilet stool which form no part of the claimed design. 

CLAIM The ornamental design for a toilet stool, as shown and described. 